public override CollisionData CheckCollision(Collider collider)
{
//these values will be returned if there isn't a collision
bool didCollide = false;
float collisionDepth = 0;
Vector2 collisionAngle = new Vector2();
if (collider is CircleCollider)
{
CircleCollider circleCollider = (CircleCollider)collider;
//check for collision
Vector2 r = circleCollider.Body.Pos + circleCollider.Pos - (Body.Pos + Pos);
collisionDepth = (radius + circleCollider.Radius) - r.Length();
if (collisionDepth > 0)
{
didCollide = true;
//collision angle
r.Normalize();
collisionAngle = r;
}
}
else if (collider is RectangleCollider)
{
RectangleCollider rectangleCollider = (RectangleCollider)collider;
Vector2 myPos = Body.Pos + Pos;
Vector2 otherPos = rectangleCollider.Body.Pos + rectangleCollider.Pos;
//top left region
if (myPos.X < otherPos.X && myPos.Y < otherPos.Y)
{
Vector2 r = otherPos - myPos;
collisionDepth = radius - r.Length();
if (collisionDepth > 0)
{
didCollide = true;
r.Normalize();
collisionAngle = r;
}
}
//top right region
else if (myPos.X > otherPos.X + rectangleCollider.Dimensions.X && myPos.Y < otherPos.Y)
{
Vector2 r = otherPos + new Vector2(rectangleCollider.Dimensions.X, 0) - myPos;
collisionDepth = radius - r.Length();
if (collisionDepth > 0)
{
didCollide = true;
r.Normalize();
collisionAngle = r;
}
}
//bottom right region
else if (myPos.X > otherPos.X + rectangleCollider.Dimensions.X && myPos.Y > otherPos.Y + rectangleCollider.Dimensions.Y)
{
Vector2 r = otherPos + rectangleCollider.Dimensions - myPos;
collisionDepth = radius - r.Length();
if (collisionDepth > 0)
{
didCollide = true;
r.Normalize();
collisionAngle = r;
}
}
//bottom left region
else if (myPos.X < otherPos.X && myPos.Y > otherPos.Y + rectangleCollider.Dimensions.Y)
{
Vector2 r = otherPos + new Vector2(0, rectangleCollider.Dimensions.Y) - myPos;
collisionDepth = radius - r.Length();
if (collisionDepth > 0)
{
didCollide = true;
r.Normalize();
collisionAngle = r;
}
}
//if it isn't in any of those regions, it's basically a square
else
{
Collider rectangularHull = new RectangleCollider(Body, CollisionGroup, new Vector2(Pos.X - Radius, pos.Y - Radius), new Vector2(radius * 2, radius * 2), OnCollision);
CollisionData collisionData = rectangularHull.CheckCollision(rectangleCollider);
didCollide = collisionData.DidCollide;
collisionDepth = collisionData.CollisionDepth;
collisionAngle = collisionData.CollisionAngle;
}
}
return(new CollisionData(didCollide, collisionDepth, collisionAngle, this, collider));
}
public override CollisionData CheckCollision(Collider collider)
{
//these values will be returned if there isn't a collision
bool didCollide = false;
float collisionDepth = 0;
Vector2 collisionAngle = new Vector2();
if (collider is RectangleCollider)
{
RectangleCollider rectangleCollider = (RectangleCollider)collider;
Vector2 myPos = Body.Pos + Pos;
Vector2 otherPos = rectangleCollider.Body.Pos + rectangleCollider.Pos;
//check for collision
if (myPos.Y < otherPos.Y + rectangleCollider.Dimensions.Y && myPos.Y + Dimensions.Y > otherPos.Y && myPos.X < otherPos.X + rectangleCollider.Dimensions.X && myPos.X + Dimensions.X > otherPos.X)
{
didCollide = true;
//check if it's a vertical collision
Vector2 r = otherPos - myPos;
float collisionAngleConstant = (Dimensions.Y + rectangleCollider.Dimensions.Y) / (Dimensions.X + rectangleCollider.Dimensions.X);
if (Math.Abs(r.Y) >= collisionAngleConstant * Math.Abs(r.X))
{
if (myPos.Y < otherPos.Y)
{
collisionAngle = new Vector2(0, 1);
//collision depth
collisionDepth = myPos.Y + Dimensions.Y - otherPos.Y;
}
else
{
collisionAngle = new Vector2(0, -1);
//collision depth
collisionDepth = otherPos.Y + rectangleCollider.Dimensions.Y - myPos.Y;
}
}
//if it's a horizontal collision
else
{
if (myPos.X < otherPos.X)
{
collisionAngle = new Vector2(1, 0);
//collision depth
collisionDepth = myPos.X + Dimensions.X - otherPos.X;
}
else
{
collisionAngle = new Vector2(-1, 0);
//collision depth
collisionDepth = otherPos.X + rectangleCollider.Dimensions.X - myPos.X;
}
}
}
}
else if (collider is CircleCollider)
{
CollisionData collisionData = collider.CheckCollision(this);
didCollide = collisionData.DidCollide;
collisionDepth = collisionData.CollisionDepth;
collisionAngle = -collisionData.CollisionAngle;
}
return(new CollisionData(didCollide, collisionDepth, collisionAngle, this, collider));
}